1720 



The Cornell Reading-Courses 



In Fig. 76 * is shown the distribution in length of 327 ears of corn, 

 whose seed came from 10-inch ears. It will be seen that these ears ranged 

 in length from 3 inches to 12 inches, the greatest number being 9 inches 



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Fig. 76. — Distribution table. Length of ears of corn, measured in inches 



long. The gradual decrease in frequency on either side of the 9-inch 

 class should be noted. 



In Fig. 77 is shown the distribution in length of 317 heads of wheat. 

 These 317 heads were not descended from heads of a certain length, but 

 represent a population of wheat and show the fluctuating variability. 



* Davenport, Eugene. Principles of Breeding, p. 421. 



